AutoCodes – Generic – P2779

P2779 Code - Downshift Switch Circuit Range/Performance

Quick Answer

The Engine Control Module (ECM) monitors the Downshift Switch Circuit signal. Common causes include Faulty Downshift Switch, Downshift Switch harness is open or shorted, Downshift Switch circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P2779 indicates Downshift Switch Circuit Range/Performance.
Common causes: Common causes include Faulty Downshift Switch, Downshift Switch harness is open or shorted, Downshift Switch circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 7,127

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Feb 13, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P2779 Description

The Engine Control Module (ECM) monitors the Downshift Switch Circuit signal. The ECM sets the OBDII code when the Downshift Switch Circuit signal is out of factory specifications.

OBDII Code P2779 - Downshift Switch Circuit Range/Performance - AutoCodes.com — P2779 Code - Downshift Switch Circuit Range/Performance

What does this mean?

What are the Possible Causes of the DTC P2779?

Faulty Downshift Switch
Downshift Switch harness is open or shorted
Downshift Switch circuit poor electrical connection

How to Fix the DTC P2779?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P2779 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P2779 code?

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Information for Specific Makes

P2779 Dodge — Downshift Switch Circuit Range/Performance

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.